Nut-lock.



No. 669,965. I Patented Mar, rz, |901.

s. s. Munson.

NUT LOCK.

(Application led Oct; 9, 1900.)

(Nn Nudel.)

I mi

(g1 W By M' OHNEYS SAMUEL STEWART JAMISON, OF SALTSBURG, PENNSYLVANIA.

NUT-LOCK.

SPECIFICATION forming` part of Letters Patent N o. 669,965, dated March 12, 1901.

Application led October 9, 1900. Serial No. 32,473. (No model.)

To all whom it muy concern:

Be it known that I, SAMUEL STEWART JAMI- SON, of Saltslourg, in the county of Indiana and State of Pennsylvania, have invented a new and useful Improvement in Nut-Locks, of which the followingis a specification.

The object of my invention is to provide an improved form of bolt and nut which shall be cheap, strong, quickly applied, and when once applied will be locked for all time until it is desired to remove it, so that there is no such thing as accidental loosening and dislodgment of the nut. For many reasons the ordinary screw-bolt and nut are not satisfactory. The nut is liable to loosen and come off, the threads are liable to strip and to rust, and considerable time is required to turn on and off the nuts. An eort to overcome some of these difficulties has been made by making the nut and bolt without threads and making the bolt with a hollow end and upsetting or expanding the bolt end in the nut by a rivet connection. My invention follows this general method; and it consists in the special construction and arrangement of the nut, as will be hereinafter fully described, with reference to the drawings, in which- Figure lis a partly sectional and partly side view of the nut-lock, the rail, and the setting devices. Fig. 2 is a side View, partly in section, of the bolt; Fig. 3, an end view of the same; Fig. 4, a section through the nut; Fig. 5, a face view of the nut; and Fig. 6, a sectional View of the upset end of the bolt in the nut,forming a permanent and tight lock.

Ais the bolt, which may be of any shape in cross-section, but is at its end opposite the head a bored out or forged with a central hole a.

B is the nut, which may be round, square, or other external shape and has a round or other-shaped hole closely fitting the bolt at one side Z9' and gradually increasingin diameter toward the other face by a succession of independent and disconnected steps h2 b3, which have between them sharp detent edges extending all around. This stepped construction of the tapered hole has a very important function, as will be described farther along. After the bolt is put in place through the fish-plate of the railor other parts to be held together the nut is slipped on, with the smaller orifice next to the fish-plate, and' atapered tool is then inserted in the central cavity a' of the bolt, and a blow from a sledgehammer on said tool is made to expand the end of the bolt to a divergent end that lls the larger opening in the outer side of the nut. Now if said nut has only a straight smooth taper, as heretofore, it will not be possible to expand the bolt end to such a tight fit as to perfectly iill the straight tapered hole on account of the elasticity or spring of the metal, and the result would be that the nut is not held tightly against its bearing, and being loose it rattes and is also defec tive in holding power; but when 'the nut is made with a series of steps b b2 b3 the metal of the bolt is spread into these steps, and each shoulder between the steps forms a sort of detent that is tightly and closely buried into the metal of the bolt, so that the bolt and nut are held tightly together in the same position in which they are riveted together. Another distinction is that when a bolt end is expanded in a straight tapered hole of a nut after the upset end of the bolt comes to a fiat bearing against the tapered hole any further upsetting action tends to burst the nut; With my construction of nut this does Nnot take place, as the angular edges between the steps bury into the bolt end and allow the metal of the latter to spread into the angular recesses between the angular projections.

This bolt, it will be seen, is very much cheaper than a screw-bolt, as there are no threads to be cut, takes little or no time to apply it, and when once set is firmly locked without any possibility of ever coming oif. To quickly apply the same, I have devised a special machine consisting of a strong C- shaped metal frame (l, having one end c2 forked and in the slot of the fork a pivoted or swinging anvil-piece E and behind it a lever D, fulcru med on a pin d in the fork and having a cam-head d, which is adapted to bear against the back of the swinging anvil E. The other end c' of the C-shaped frame has a perforation c in line With the anvil-head and adapted to retain a tapered expandingtool D, which is thus brought in line with the hole a' in the bolt. The end c' of the frame C is made to bear against the nut B, and

IOO

When the lever D is turned down this endV c on one side and the anvil E on the other are inade to clamp and hold the bolt, nut, shplate, and rails together to a tightly-closed position While being riveted. A stroke of a hammer then delivered upon the end of the 4 tool D serves to upset the end of the bolt in the nut and to tightly connect these parts together Without loosening up after the settingtool is removed.

Both the head of the anvil E and the rigid head c' are countersun'k, so as to support the nut and bolt-head and keep the tool in place during its application. The tool D is designed to be loosely retained in the head c by means of a slot and set-screw, as shown.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

lar projections in its inner face substantially as described.

2. A nut having a generally-tapered hole through it provided With a series of independent angular projections running all around theinner face of said hole substantially as described.

3. The combination with a bolt having a hole in its end; of a nut having a tapered hole through it provided on its inner face With a series of independent angular projections on it substantially as described.

SAMUELl STEWART JAMISON.

Witnesses:

J oE A. MCOLARAN, J. F. PIPER. 

